Tetraaryl arylaminium salts and use as infrared absorbers

ABSTRACT

A DEFINED CLASS OF DIARYL-(N,N-DIARYLAMINOARYL)AMINIUM SALTS USEFUL AS INFRARED ABSORBERS IS DISCLOSED; ESPECIALLY THE BIS(P-DIALKYLAMINOPHENYL)(N,N-BIS(P-DIALKYLAMINOPHENYL)-P -AMINOPHENYL)AMINIUM SALTS, SUCH AS BIS(P-DIETHLAMINOPHENYL)(N,N-BIS(P-DIETHYLAMINOPHENYL)-P-AMINOPHENYL)AMINIUM HEXAFLUOROANTIMONATE. THE AMINIUM SALTS ARE OBTAINED BY OXIDATION OF N,N,N&#39;&#39;, N&#39;&#39;,TETRAARYLARYLENEDIAMINES WITH SILVER SALTS.



